WebSocket

socket config

package com.example.springbootmybatisredis.conf;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

/**
 * ClassName:WebSocketConfig
 * Package:com.example.springbootmybatisredis.conf
 * Description:
 *
 * @date:2021/7/19 17:40
 * @author:xy
 */
@Configuration
public class WebSocketConfig {

    /**
     * 注入一个ServerEndpointExporter,该Bean会自动注册使用@ServerEndpoint注解申明的websocket endpoint
     */
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }

}

Controller

package com.example.springbootmybatisredis.controller;

import com.alibaba.fastjson.JSON;
import com.example.springbootmybatisredis.dto.Message;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * ClassName:WebSocketController
 * Package:com.example.springbootmybatisredis.controller
 * Description:
 *
 * @date:2021/7/19 17:46
 * @author:xy
 */
/**
 * 前后端交互的类实现消息的接收推送(自己发送给另一个人)
 *
 * @ServerEndpoint(value = "/test/oneToOne") 前端通过此URI 和后端交互，建立连接
 */
@Slf4j
@ServerEndpoint(value = "/test/oneToOne")
@Component
public class OneToOneWebSocket {

    /** 记录当前在线连接数 */
    private static AtomicInteger onlineCount = new AtomicInteger(0);

    /** 存放所有在线的客户端 */
    private static Map<String, Session> clients = new ConcurrentHashMap<>();

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session) {
        onlineCount.incrementAndGet(); // 在线数加1
        clients.put(session.getId(), session);
        log.info("有新连接加入：{}，当前在线人数为：{}", session.getId(), onlineCount.get());
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose(Session session) {
        onlineCount.decrementAndGet(); // 在线数减1
        clients.remove(session.getId());
        log.info("有一连接关闭：{}，当前在线人数为：{}", session.getId(), onlineCount.get());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message
     *            客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        log.info("服务端收到客户端[{}]的消息[{}]", session.getId(), message);
        try {
            Message myMessage = JSON.parseObject(message, Message.class);
            if (myMessage != null) {
                Session toSession = clients.get(myMessage.getUserId());
                if (toSession != null) {
                    this.sendMessage(myMessage.getMessage(), toSession);
                }
            }
        } catch (Exception e) {
            log.error("解析失败：{}", e);
        }
    }

    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误");
        error.printStackTrace();
    }

    /**
     * 服务端发送消息给客户端
     */
    private void sendMessage(String message, Session toSession) {
        try {
            log.info("服务端给客户端[{}]发送消息[{}]", toSession.getId(), message);
            toSession.getBasicRemote().sendText(message);
        } catch (Exception e) {
            log.error("服务端发送消息给客户端失败：{}", e);
        }
    }

}

传递dto对象

package com.example.springbootmybatisredis.dto;

/**
 * ClassName:message
 * Package:com.example.springbootmybatisredis.dto
 * Description:
 *
 * @date:2021/7/19 18:30
 * @author:xy
 */
import lombok.Data;
@Data
public class Message {
    String message;
    String userId;
}

HTML 自测页面

package com.example.springbootmybatisredis.conf;

import com.example.springbootmybatisredis.SpringbootmybatisredisApplication;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * ClassName:html
 * Package:com.example.springbootmybatisredis.conf
 * Description:
 *
 * @date:2021/7/19 18:09
 * @author:xy
 */
@SpringBootApplication
public class html implements WebMvcConfigurer {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootmybatisredisApplication.class, args);
    }

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("index");
    }

}

<!-- websocket -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-websocket</artifactId>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

 yml
resources:
  static-locations: classpath:/templates/